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Fixed diagnostic messages on enumerator overflow.

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An enumerator that would be incremented greater than ULONG_MAX now causes an error.
This commit is contained in:
acqn 2022-11-02 14:22:21 +08:00
parent ad7c5a6617
commit deb5e97732
2 changed files with 22 additions and 12 deletions
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25
src/cc65/declare.c
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@ -611,20 +611,20 @@ static SymEntry* ParseEnumDecl (const char* Name, unsigned* DSFlags)
} else {
/* Defaulted with the same signedness as the previous member's */
/* Defaulted with the same signedness as the previous member's */
IsSigned = IsSignSigned (MemberType) &&
(unsigned long)EnumVal != GetIntegerTypeMax (MemberType);
/* Enumerate. Signed integer overflow is UB but unsigned integers
** are guaranteed to wrap around.
*/
EnumVal = (long)((unsigned long)EnumVal + 1UL);
/* Enumerate by adding one to the previous value */
EnumVal = (long)(((unsigned long)EnumVal + 1UL) & 0xFFFFFFFFUL);
if (UnqualifiedType (MemberType->C) == T_ULONG && EnumVal == 0) {
/* Warn on 'unsigned long' overflow in enumeration */
Warning ("Enumerator '%s' overflows the range of '%s'",
Ident,
GetBasicTypeName (type_ulong));
/* Error since the new value cannot be represented in the
** largest unsigned integer type supported by cc65 for enum.
*/
Error ("Enumerator '%s' overflows the range of '%s'",
Ident,
GetBasicTypeName (type_ulong));
}
IsIncremented = 1;
@ -657,11 +657,12 @@ static SymEntry* ParseEnumDecl (const char* Name, unsigned* DSFlags)
/* Warn if the incremented value exceeds the range of the previous
** type.
*/
if (IsIncremented &&
EnumVal >= 0 &&
if (PrevErrorCount == ErrorCount &&
IsIncremented &&
(!IsSigned || EnumVal >= 0) &&
NewType->C != UnqualifiedType (MemberType->C)) {
/* The possible overflow here can only be when EnumVal > 0 */
Warning ("Enumerator '%s' (value = %lu) is of type '%s'",
Warning ("Enumerator '%s' (value = %lu) implies type '%s'",
Ident,
(unsigned long)EnumVal,
GetBasicTypeName (NewType));

9
test/err/bug1890.c Normal file
View File

@ -0,0 +1,9 @@
/* bug #1890 - Overflow in enumerator value is not detected */
#include <limits.h>
enum { a = ULONG_MAX, b } c = b;
int main(void)
{
return 0;
}